> Hi gang,
>
> My MCV4 MIDI to CV converter has started to act weirdly. It seems it
> only reacts to a few percent of the MIDI messages sent to it - e.g. if
> I press the learn button I have to press a key on my keyboard several
> time before the LED stops blinking, and after that I have to press a
> key several times to get a note on to result in a gate - which doesn't
> turn off again when the key is released. I've tested the keyboard with
> other MIDI gear and it works just fine, tried changing the MIDI cable
> and tried using other controllers to send Note on/offs to the MCV4,
> and every test I've made points to the MCV4 as the culprit.
>
> I have of course tried to disconnect and reconnect power several times
> and that didn't solve the problem. I'm wondering if there's a chance
> this can be fixed (and if it's worth it compared to buying a new one)
> or if I should just order a new MIDI to CV converter (thinking of
> upgrading to the A-190 if that's the case, or maybe look into getting
> something with more CV outs - why oh why was the MCV24 discontinued
> :-/ ).
>
> I'm obviously keen on getting this problem solved very soon - my synth
> would still be very usable lacking one VCO, filter or what have you,
> but with no control by keyboard nor cubase I'm pretty limited...
>
> Regards,
> Silas

Some questions:

Do you have changed anything (e.g. do you use the same Midi source to
control the MCV4 as before, the same cables)
If yes, go back to the former configuration that was working.

If this does not help initialize the MCV4 as mentioned in the user's manual
on page 6.

Pay attention that the correct messages are sent when you program the MCV4 !
Some controllers send "hidden" messages that program the MCV4 in another way
than one would assume. E.g. if the MCV4 is in the learn mode and the Midi
keyboard transmits a Midi control change message before each program change
you don't have a chance to adjust the MCV4 with program change messages as
the control change comes before the program change and is used to assign the
control change number to the free programmable controller of the MCV4.

Good luck
Dieter Doepfer